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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Copyright (C) 2010 TTPASI, Inc. All Rights Reserved.<a name="line.2"></a>
<FONT color="green">003</FONT>     *<a name="line.3"></a>
<FONT color="green">004</FONT>     * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<FONT color="green">005</FONT>     * you may not use this file except in compliance with the License.<a name="line.5"></a>
<FONT color="green">006</FONT>     * You may obtain a copy of the License at<a name="line.6"></a>
<FONT color="green">007</FONT>     *<a name="line.7"></a>
<FONT color="green">008</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<FONT color="green">011</FONT>     * distributed under the License is distributed on an "AS-IS" BASIS,<a name="line.11"></a>
<FONT color="green">012</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<FONT color="green">013</FONT>     * See the License for the specific language governing permissions and<a name="line.13"></a>
<FONT color="green">014</FONT>     * limitations under the License.<a name="line.14"></a>
<FONT color="green">015</FONT>     */<a name="line.15"></a>
<FONT color="green">016</FONT>    <a name="line.16"></a>
<FONT color="green">017</FONT>    package ttpasi.jgenere.chaocipher;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    import java.util.LinkedList;<a name="line.19"></a>
<FONT color="green">020</FONT>    import java.util.List;<a name="line.20"></a>
<FONT color="green">021</FONT>    import java.util.Set;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.util.TreeSet;<a name="line.22"></a>
<FONT color="green">023</FONT>    <a name="line.23"></a>
<FONT color="green">024</FONT>    public class SequenceFinder<a name="line.24"></a>
<FONT color="green">025</FONT>    {<a name="line.25"></a>
<FONT color="green">026</FONT>      private final String _lt;<a name="line.26"></a>
<FONT color="green">027</FONT>      private final String _rt;<a name="line.27"></a>
<FONT color="green">028</FONT>      private final String _ct;<a name="line.28"></a>
<FONT color="green">029</FONT>      private final String _pt;<a name="line.29"></a>
<FONT color="green">030</FONT>    <a name="line.30"></a>
<FONT color="green">031</FONT>      public SequenceFinder(String lt, String rt, String ct, String pt)<a name="line.31"></a>
<FONT color="green">032</FONT>      {<a name="line.32"></a>
<FONT color="green">033</FONT>        this._lt = lt;<a name="line.33"></a>
<FONT color="green">034</FONT>        this._rt = rt;<a name="line.34"></a>
<FONT color="green">035</FONT>        this._ct = ct;<a name="line.35"></a>
<FONT color="green">036</FONT>        this._pt = pt;<a name="line.36"></a>
<FONT color="green">037</FONT>      }<a name="line.37"></a>
<FONT color="green">038</FONT>    <a name="line.38"></a>
<FONT color="green">039</FONT>      public List findSequences()<a name="line.39"></a>
<FONT color="green">040</FONT>      {<a name="line.40"></a>
<FONT color="green">041</FONT>        List sequences = new LinkedList();<a name="line.41"></a>
<FONT color="green">042</FONT>    <a name="line.42"></a>
<FONT color="green">043</FONT>        int length = _ct.length();<a name="line.43"></a>
<FONT color="green">044</FONT>        for (int i = 0; i &lt; length; i++)<a name="line.44"></a>
<FONT color="green">045</FONT>        {<a name="line.45"></a>
<FONT color="green">046</FONT>          int ctLength = findSequenceLength(charSet(_lt), _ct, i);<a name="line.46"></a>
<FONT color="green">047</FONT>          int ptLength = findSequenceLength(charSet(_rt), _pt, i);<a name="line.47"></a>
<FONT color="green">048</FONT>          if (ctLength &gt;= 0 &amp;&amp; ptLength &gt;= 0)<a name="line.48"></a>
<FONT color="green">049</FONT>          {<a name="line.49"></a>
<FONT color="green">050</FONT>            int maxLength = Math.max(ctLength, ptLength);<a name="line.50"></a>
<FONT color="green">051</FONT>            sequences.add(new Sequence(_ct.substring(i, maxLength), _pt.substring(i, maxLength)));<a name="line.51"></a>
<FONT color="green">052</FONT>          }<a name="line.52"></a>
<FONT color="green">053</FONT>          else<a name="line.53"></a>
<FONT color="green">054</FONT>          {<a name="line.54"></a>
<FONT color="green">055</FONT>            break;<a name="line.55"></a>
<FONT color="green">056</FONT>          }<a name="line.56"></a>
<FONT color="green">057</FONT>        }<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>        return sequences;<a name="line.59"></a>
<FONT color="green">060</FONT>      }<a name="line.60"></a>
<FONT color="green">061</FONT>    <a name="line.61"></a>
<FONT color="green">062</FONT>      public List findMinSequencesWithHoles(int targetHolesCount)<a name="line.62"></a>
<FONT color="green">063</FONT>      {<a name="line.63"></a>
<FONT color="green">064</FONT>        List sequences = new LinkedList();<a name="line.64"></a>
<FONT color="green">065</FONT>    <a name="line.65"></a>
<FONT color="green">066</FONT>        int length = _ct.length();<a name="line.66"></a>
<FONT color="green">067</FONT>        for (int i = 0; i &lt; length; i++)<a name="line.67"></a>
<FONT color="green">068</FONT>        {<a name="line.68"></a>
<FONT color="green">069</FONT>          int ctLength = findSequenceLength(charSet(_lt), _ct, i);<a name="line.69"></a>
<FONT color="green">070</FONT>          int ptLength = findSequenceLength(charSet(_rt), _pt, i);<a name="line.70"></a>
<FONT color="green">071</FONT>          if (ctLength &gt; 0 &amp;&amp; ptLength &gt; 0)<a name="line.71"></a>
<FONT color="green">072</FONT>          {<a name="line.72"></a>
<FONT color="green">073</FONT>            int maxLength = Math.max(ctLength, ptLength);<a name="line.73"></a>
<FONT color="green">074</FONT>            Sequence sequence = new Sequence(_ct.substring(i, i + maxLength), _pt.substring(i, i + maxLength));<a name="line.74"></a>
<FONT color="green">075</FONT>            int currentHolesCount = new HoleFinder(sequence._ct, sequence._pt).countHoles();<a name="line.75"></a>
<FONT color="green">076</FONT>            if (currentHolesCount == targetHolesCount)<a name="line.76"></a>
<FONT color="green">077</FONT>            {<a name="line.77"></a>
<FONT color="green">078</FONT>              sequences.add(sequence);<a name="line.78"></a>
<FONT color="green">079</FONT>            }<a name="line.79"></a>
<FONT color="green">080</FONT>          }<a name="line.80"></a>
<FONT color="green">081</FONT>          else<a name="line.81"></a>
<FONT color="green">082</FONT>          {<a name="line.82"></a>
<FONT color="green">083</FONT>            break;<a name="line.83"></a>
<FONT color="green">084</FONT>          }<a name="line.84"></a>
<FONT color="green">085</FONT>        }<a name="line.85"></a>
<FONT color="green">086</FONT>    <a name="line.86"></a>
<FONT color="green">087</FONT>        return sequences;<a name="line.87"></a>
<FONT color="green">088</FONT>      }<a name="line.88"></a>
<FONT color="green">089</FONT>    <a name="line.89"></a>
<FONT color="green">090</FONT>      public List findMaxSequencesWithHoles(int targetHolesCount)<a name="line.90"></a>
<FONT color="green">091</FONT>      {<a name="line.91"></a>
<FONT color="green">092</FONT>        List sequences = new LinkedList();<a name="line.92"></a>
<FONT color="green">093</FONT>    <a name="line.93"></a>
<FONT color="green">094</FONT>        int length = _ct.length();<a name="line.94"></a>
<FONT color="green">095</FONT>        for (int i = 0; i &lt; length; i++)<a name="line.95"></a>
<FONT color="green">096</FONT>        {<a name="line.96"></a>
<FONT color="green">097</FONT>          int ctLength = findSequenceLength(charSet(_lt), _ct, i);<a name="line.97"></a>
<FONT color="green">098</FONT>          int ptLength = findSequenceLength(charSet(_rt), _pt, i);<a name="line.98"></a>
<FONT color="green">099</FONT>          if (ctLength &gt; 0 &amp;&amp; ptLength &gt; 0)<a name="line.99"></a>
<FONT color="green">100</FONT>          {<a name="line.100"></a>
<FONT color="green">101</FONT>            int maxLength = Math.max(ctLength, ptLength);<a name="line.101"></a>
<FONT color="green">102</FONT>            Sequence sequence = new Sequence(_ct.substring(i, i + maxLength), _pt.substring(i, i + maxLength));<a name="line.102"></a>
<FONT color="green">103</FONT>            int currentHolesCount = new HoleFinder(sequence._ct, sequence._pt).countHoles();<a name="line.103"></a>
<FONT color="green">104</FONT>            if (currentHolesCount &lt;= targetHolesCount)<a name="line.104"></a>
<FONT color="green">105</FONT>            {<a name="line.105"></a>
<FONT color="green">106</FONT>              // expand the sequence forward until the targetHolesCount reached,<a name="line.106"></a>
<FONT color="green">107</FONT>              // and then keep expanding as far as possible and still have targetHolesCount<a name="line.107"></a>
<FONT color="green">108</FONT>              for (int j = i + maxLength; j &lt; length; j++)<a name="line.108"></a>
<FONT color="green">109</FONT>              {<a name="line.109"></a>
<FONT color="green">110</FONT>                while (currentHolesCount &lt; targetHolesCount &amp;&amp; j &lt; length)<a name="line.110"></a>
<FONT color="green">111</FONT>                {<a name="line.111"></a>
<FONT color="green">112</FONT>                  String currentCt = sequence._ct;<a name="line.112"></a>
<FONT color="green">113</FONT>                  String currentPt = sequence._pt;<a name="line.113"></a>
<FONT color="green">114</FONT>                  char nextCtChar = _ct.charAt(j);<a name="line.114"></a>
<FONT color="green">115</FONT>                  char nextPtChar = _pt.charAt(j);<a name="line.115"></a>
<FONT color="green">116</FONT>                  String nextCt = currentCt + nextCtChar;<a name="line.116"></a>
<FONT color="green">117</FONT>                  String nextPt = currentPt + nextPtChar;<a name="line.117"></a>
<FONT color="green">118</FONT>                  sequence = new Sequence(nextCt, nextPt);<a name="line.118"></a>
<FONT color="green">119</FONT>                  currentHolesCount = new HoleFinder(sequence._ct, sequence._pt).countHoles();<a name="line.119"></a>
<FONT color="green">120</FONT>                  j++;<a name="line.120"></a>
<FONT color="green">121</FONT>                }<a name="line.121"></a>
<FONT color="green">122</FONT>                Sequence nextSequence = new Sequence(sequence._ct, sequence._pt);<a name="line.122"></a>
<FONT color="green">123</FONT>                int nextHolesCount = currentHolesCount;<a name="line.123"></a>
<FONT color="green">124</FONT>                while (nextHolesCount &lt;= targetHolesCount &amp;&amp; j &lt; length)<a name="line.124"></a>
<FONT color="green">125</FONT>                {<a name="line.125"></a>
<FONT color="green">126</FONT>                  String currentCt = sequence._ct;<a name="line.126"></a>
<FONT color="green">127</FONT>                  String currentPt = sequence._pt;<a name="line.127"></a>
<FONT color="green">128</FONT>                  char nextCtChar = _ct.charAt(j);<a name="line.128"></a>
<FONT color="green">129</FONT>                  char nextPtChar = _pt.charAt(j);<a name="line.129"></a>
<FONT color="green">130</FONT>                  String nextCt = currentCt + nextCtChar;<a name="line.130"></a>
<FONT color="green">131</FONT>                  String nextPt = currentPt + nextPtChar;<a name="line.131"></a>
<FONT color="green">132</FONT>                  nextHolesCount = new HoleFinder(nextCt, nextPt).countHoles();<a name="line.132"></a>
<FONT color="green">133</FONT>                  if (nextHolesCount &lt;= targetHolesCount)<a name="line.133"></a>
<FONT color="green">134</FONT>                  {<a name="line.134"></a>
<FONT color="green">135</FONT>                    nextSequence = new Sequence(nextCt, nextPt);<a name="line.135"></a>
<FONT color="green">136</FONT>                  }<a name="line.136"></a>
<FONT color="green">137</FONT>                  j++;<a name="line.137"></a>
<FONT color="green">138</FONT>                }<a name="line.138"></a>
<FONT color="green">139</FONT>                sequence = nextSequence;<a name="line.139"></a>
<FONT color="green">140</FONT>              }<a name="line.140"></a>
<FONT color="green">141</FONT>              if (currentHolesCount == targetHolesCount)<a name="line.141"></a>
<FONT color="green">142</FONT>              {<a name="line.142"></a>
<FONT color="green">143</FONT>                sequences.add(sequence);<a name="line.143"></a>
<FONT color="green">144</FONT>              }<a name="line.144"></a>
<FONT color="green">145</FONT>            }<a name="line.145"></a>
<FONT color="green">146</FONT>          }<a name="line.146"></a>
<FONT color="green">147</FONT>          else<a name="line.147"></a>
<FONT color="green">148</FONT>          {<a name="line.148"></a>
<FONT color="green">149</FONT>            break;<a name="line.149"></a>
<FONT color="green">150</FONT>          }<a name="line.150"></a>
<FONT color="green">151</FONT>        }<a name="line.151"></a>
<FONT color="green">152</FONT>    <a name="line.152"></a>
<FONT color="green">153</FONT>        return sequences;<a name="line.153"></a>
<FONT color="green">154</FONT>      }<a name="line.154"></a>
<FONT color="green">155</FONT>    <a name="line.155"></a>
<FONT color="green">156</FONT>      private static int findSequenceLength(Set alphabet, String text, int start)<a name="line.156"></a>
<FONT color="green">157</FONT>      {<a name="line.157"></a>
<FONT color="green">158</FONT>        int count = 0;<a name="line.158"></a>
<FONT color="green">159</FONT>        int length = text.length();<a name="line.159"></a>
<FONT color="green">160</FONT>        for (int i = start; i &lt; length &amp;&amp; !alphabet.isEmpty(); i++)<a name="line.160"></a>
<FONT color="green">161</FONT>        {<a name="line.161"></a>
<FONT color="green">162</FONT>          count++;<a name="line.162"></a>
<FONT color="green">163</FONT>          alphabet.remove(new Character(text.charAt(i)));<a name="line.163"></a>
<FONT color="green">164</FONT>        }<a name="line.164"></a>
<FONT color="green">165</FONT>        return alphabet.isEmpty() ? count : -1;<a name="line.165"></a>
<FONT color="green">166</FONT>      }<a name="line.166"></a>
<FONT color="green">167</FONT>    <a name="line.167"></a>
<FONT color="green">168</FONT>      private static Set charSet(String alphabet)<a name="line.168"></a>
<FONT color="green">169</FONT>      {<a name="line.169"></a>
<FONT color="green">170</FONT>        Set chars = new TreeSet();<a name="line.170"></a>
<FONT color="green">171</FONT>        char[] alphabetChars = alphabet.toCharArray();<a name="line.171"></a>
<FONT color="green">172</FONT>        for (int i = 0; i &lt; alphabetChars.length; i++)<a name="line.172"></a>
<FONT color="green">173</FONT>        {<a name="line.173"></a>
<FONT color="green">174</FONT>          chars.add(new Character(alphabetChars[i]));<a name="line.174"></a>
<FONT color="green">175</FONT>        }<a name="line.175"></a>
<FONT color="green">176</FONT>        return chars;<a name="line.176"></a>
<FONT color="green">177</FONT>      }<a name="line.177"></a>
<FONT color="green">178</FONT>    <a name="line.178"></a>
<FONT color="green">179</FONT>      public static final class Sequence<a name="line.179"></a>
<FONT color="green">180</FONT>      {<a name="line.180"></a>
<FONT color="green">181</FONT>        public final String _ct;<a name="line.181"></a>
<FONT color="green">182</FONT>        public final String _pt;<a name="line.182"></a>
<FONT color="green">183</FONT>    <a name="line.183"></a>
<FONT color="green">184</FONT>        Sequence(String ct, String pt)<a name="line.184"></a>
<FONT color="green">185</FONT>        {<a name="line.185"></a>
<FONT color="green">186</FONT>          this._ct = ct;<a name="line.186"></a>
<FONT color="green">187</FONT>          this._pt = pt;<a name="line.187"></a>
<FONT color="green">188</FONT>        }<a name="line.188"></a>
<FONT color="green">189</FONT>      }<a name="line.189"></a>
<FONT color="green">190</FONT>    }<a name="line.190"></a>




























































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